noun, adverb
A somewhat literary or old-fashioned word for 'last night'. In modern casual speech, 昨夜 (ゆうべ/さくや) or 昨日の夜 are more common. Can be used as a noun or adverb.
夜前の雨で道がぬかるんでいる。
The road is muddy from last night's rain.
夜前、不思議な夢を見た。
Last night I had a strange dream.